course Phys 202
the average time between collisions is about 2 seconds. The average speed is about 4.The blue atom is heavier and bigger so it moves slower.
THe red atoms turns yellow when it hits the yellow atom and they move together. This is elastic collision.
THe graphs I believe are the number of time the atom has colladed at that particular second. The colums change as the red atom was colliding.
Good. You can proceed to do #3 in this series.